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Photonics Asia 2004:Information Processing and Data storage

作者： Wusheng Xu? Yuheng Xu Jian Zhang Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China 1.

The optical properties of the Ce:Cu:LiNbO3 co-doped with different concentrations of In were measured, including absorption spectra, infrared transmittance spectra and holographic storage properties.

关键词： In:Ce:Cu:LiNbO3 crystals holographic storage photorefractive

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Study on the Noise Signal for the Volume holographic storage System

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通讯和计算机（中英文版） 2005年第7期2卷 56-58页

作者： Fei Wu Changsheng Xie Zhaobin Liu National Laboratory of storage System HuaZhong University of Science ＆ Technology Wuhan 430074 China

Volume holographic storage (VHS) is currently the subject of widespread interest as a fast-readout-rate, high-capacity digital data-storage technology. However, various noise cause high bit error rate (BER) in VHS high-speed channel. In the paper, we introduce the theory of VHS and analyze the characteristic of noise sources so that we can design the appropriate channel and error correction codes to decrease the BER.

关键词： Cross-talk Noise Scattering Noise Error Rate holographic storage

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The Comparison of the holographic storage Properties of Fe∶LiNbO3 and Fe∶Ce∶LiNbO3 Crystals

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Chinese Journal of Lasers 1999年第3期 72-76页

作者： JIANG Zhuqing LIU Guoqing LIU Jinwei YUAN Quan TAO Shiquan (Department of Applied Physics, Beijing Polytechnic University, Beijing 100022)

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｐｒｅｓｅｎｔ，ｔｈｅｐｈｏｔｏｒｅｆｒａｃｔｉｖｅｍａｔｅｒｉａｌｓａｒｅｗｉｄｅｌｙｕｓｅｄｆｏｒｈｉｇｈｄｅｎｓｉｔｙｈｏｌｏｇｒａｐｈｉｃｓｔｏｒａｇｅ．Ａｓｏｎｅｏｆｔ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｐｒｅｓｅｎｔ，ｔｈｅｐｈｏｔｏｒｅｆｒａｃｔｉｖｅｍａｔｅｒｉａｌｓａｒｅｗｉｄｅｌｙｕｓｅｄｆｏｒｈｉｇｈｄｅｎｓｉｔｙｈｏｌｏｇｒａｐｈｉｃｓｔｏｒａｇｅ．Ａｓｏｎｅｏｆｔｈｅｍｏｓｔｐｏｐｕｌａｒｐｈｏｔ...

关键词： photorefractive crystal holographic storage double doped

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Application of digital image processing technology in the data restoring process of multi-level digital holographic storage

Application of digital image processing technology in the da...

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20th Congress of the International Commission for Optics

作者： Fang Lihuaa Gong Yongqinga Fang Liguangb Wang Qinga aDepartment of Measuring and Control Engineering Nanchang Institute of Aeronautical Technology JiangXi China bScience college Nanchang University JiangXi China

Firstly, this paper introduces the concept of multi-level digital holographic storage. Then, application of digital image processing technology is brought forward in the data restoring process of digi

关键词： digital image processing multi-level image holographic storage

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The holographic storage property and structure of near stoichiometric In:Fe:LiNbO3 crystals

The holographic storage property and structure of near stoic...

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第14届全国晶体生长与材料学术会议

作者： Yijie Wanga, Li Daia, Jiancong Bib, Yuheng Xub aSchool of Applied science, Harbin University of Science and Technology, Harbin, 150060, China bSchool of Chemistry and Environment Engineering, Harbin University of Science and Technology, Harbin, 150040, China

LiNbO3 （LN） crystal belongs to trigonal crystal system, 3m point group and R3c space group. It is one kind of excellent photorefractive material and widely use in many fields, especially in holograph

关键词： S:In:Fe:LiNbO3 holographic storage

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POLYMER SCAFFOLDS BEARING AZOBENZENE-POTENTIAL FOR OPTICAL INFORMATION storage

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Chinese Journal of Polymer Science 2001年第2期19卷 147-153页

作者： Sφren Hvilsted P.S.Ramanujam Danish Polymer Centre Chemical Engineering Department Technical University of Denmark DK-2800 Kgs. Lyngby DenmarkOptics and Fluid Dynamics Department Risφ National LaboratoryDK-4000 Roskilde Denmark

The fundamental optical storage mechanism of the laser light eddressable azobenzene moiety is briefly introduced.A modular and flexible synthesis design furnishes polyester matrices covalently integrating cyanoazobenzene in regularlyspaced side chains. Thin films of these materials are particularly well suited for holographic storape. Notable figures of meritsof liquid crystalline polyesters are response time to blue-green laser light of the order of nanoseconds, storage capacityexpressed as 5000 lines/mm, and high, permanent (almost nine years) diffraction efficiency of the order of 50% or greater,and erasability, The implications of the main chain nature for polyester morphology and for the permanency of the inducedanisotropy are discussed, The design and methods of preparation of other significantly different polymer scaffolds supportingcyanoazobenzene are elaborated. Oligopeptides always result in amorphous materials, whereas copolymethacrylates anddendritic or hyperbranched polyesters provide some materials that exhibit liquid crystallinity. However, none of these scaffolds affords materials that result in permanent anisotropy when exposed to interfering laser light.

关键词： Azobenzene side-chain polymers Copolymethacrylates Dendrimers holographic storage LC and amorphous polyesters Morphology Oligopeptides

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Anomalous Behaviour of Photorefractive Grating Erasure Owing to Existence of both Negative and Positive Carriers

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Chinese Physics Letters 2006年第6期23卷 1462-1465页

作者：朱荣刘德安郭袁俊柴志方刘立人 Information Optics Laboratory Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

In LiNbO3：Fe, anomalous behaviour of grating erasure is observed with different wavelengths, i.e. rapid grating erasure in the short wavelength range, which deviates from the results predicted by the electron transport band model. The deviation is related to the coexistence of electrons and holes in photorefraction, and charge-transfer process including electrons and hole has been proposed. The electron and hole contributions to photoconductivity have been identified by experiments. We also give the theoretical dependence of electron photo-excitation coefficient S of the Fe centre on the wavelength.

关键词： INDUCED CHARGE-TRANSPORT holographic storage CRYSTALS INTENSITIES ULTRAVIOLET LINBO3

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A new photopolymerizable holographic recording material based on acrylamide and N-hydroxymethyl acrylamide

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Chinese Physics B 2005年第10期14卷 2004-2008页

作者：弓巧侠王素莲黄明举干福熹 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China School of Physics and Information Optoelectronics Henan University Kaifeng 475000 China

A new polyvinylalcohol-based photopolymeric holographic recording material has been developed. The recording is obtained by the copolymerization of acrylamide and N-hydroxymethyl acrylamide. Diffraction efficiencies near 50% are obtained with energetic exposure of 80mJ/cm^2. N-hydroxymethyl acrylamide can improve the optical quality of the film. With the increase of the concentration of N-hydroxymethyl acrylamide, the flatness of the film increases, scattering reduces and the straight image is clearer with a small distortion. The postexposure effect on the grating is also studied. The diffraction efficiency of grating increases further during postexposure, gradient of monomer exists after exposure.

关键词： photopolymer holographic storage sensitivity diffraction efficiency

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掺杂LiNbO_3晶体生长及在体全息存储方面的应用研究

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人工晶体学报 2000年第S1期29卷 172-页

作者：刘国庆刘金伟陶世荃江竹青北京工业大学应用物理系北京100022

In this paper,the Fe:LiNbO 3,Ce:Fe:LiNbO 3 and Ce:Mn:LiNbO 3 crystals with n o defect,were grown from melt by Czochraski *** two doped LiNbO 3 cry stals were treated by heating reduction in Li 2O 3 powder,and Fe:LiNbO 3 crys tals were oxidized in air. The measurments on lattic constants and the absorption spectrum show that the doped crystals’ structure are regular and the optical pr operties are *** absorption spectra,diffractive efficency,response time,sen sitivity,and photoconduction were *** properties of Ce:Fe:LiNbO 3 crys tals are η sat =0.25, Sη -1 =16.2mJ/mm 2, τ E/ τ W=6 .5, σ =2.99×10 -17 ;and the properties of Ce:Fe:LiNbO 3 crystals are η sat =0.70, Sη -1 =4.6mJ/mm 2, τ E/ τ W=7.2, σ =5. 42×10 -17 . The response speed of two doped LiNbO 3 crystals is faster than that of Fe:LiNbO 3 *** diffractive efficiency was measured to be high er than 80% and with a broad angle ***:LiNbO 3 crystals were oxidized in air in order to make the storage time longer and strength the diffractive effici *** it is a good kind of Volume holographic memory *** it is shown in our experiment that Ce:Fe:LiNbO 3 crystals is more sensitive to 633nm than Fe:LiNbO 3 crystals,it is more fit for He Ne laser and is a better materials o f Volume holographic Storge.

关键词： LiNbO 3 crystal crystal pu lling holographic storage doping

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